WO2014114318A1 - Télécommunications sans fil - Google Patents

Télécommunications sans fil Download PDF

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Publication number
WO2014114318A1
WO2014114318A1 PCT/EP2013/003849 EP2013003849W WO2014114318A1 WO 2014114318 A1 WO2014114318 A1 WO 2014114318A1 EP 2013003849 W EP2013003849 W EP 2013003849W WO 2014114318 A1 WO2014114318 A1 WO 2014114318A1
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WO
WIPO (PCT)
Prior art keywords
resource blocks
rach preamble
preamble signature
rach
defined set
Prior art date
Application number
PCT/EP2013/003849
Other languages
English (en)
Inventor
Shin Horng Wong
Matthew Baker
Min Zhang
Original Assignee
Alcatel Lucent
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Alcatel Lucent filed Critical Alcatel Lucent
Priority to JP2015554058A priority Critical patent/JP2016511960A/ja
Priority to CN201380071485.7A priority patent/CN104956760B/zh
Priority to US14/763,711 priority patent/US10070463B2/en
Publication of WO2014114318A1 publication Critical patent/WO2014114318A1/fr

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access
    • H04W74/08—Non-scheduled access, e.g. ALOHA
    • H04W74/0833—Random access procedures, e.g. with 4-step access
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/10—Connection setup
    • H04W76/18—Management of setup rejection or failure
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access
    • H04W74/002—Transmission of channel access control information
    • H04W74/006—Transmission of channel access control information in the downlink, i.e. towards the terminal

Definitions

  • the present invention relates to a wireless telecommunications method, a computer program product and network nodes.
  • Wireless telecommunications systems are known.
  • radio coverage is provided to user equipment, for example, mobile phones, by areas known as cells.
  • a base station is located in each cell to provide the radio coverage.
  • User equipment in each cell receives information and data from the base station and transmits
  • Information and data transmitted by the base station to the user equipment occurs on channels of radio carriers known as downlink channels.
  • Information and data transmitted by user equipment to the base station occurs on channels of radio carriers known as uplink channels.
  • a wireless telecommunications network node method comprising: on a failure to establish a connection after initiating a RACH procedure, repeatedly transmitting a RACH preamble signature using a defined set of resource blocks of an uplink channel.
  • the first aspect also recognises that existing standards fail to provide an adequate technique for proving this configuration information in high attenuation deployments, which means that user equipment implementing those standards are unable to communicate with the network during such deployment.
  • the first aspect further recognises that whilst this is inconvenient for some user equipment when located in these high attenuation areas, coverage is restored when the user equipment moves to a lower attenuation area but that there is an emerging class of user equipment (such as machine type
  • a wireless telecommunications network node method may comprise the step of, when an initiated random access channel RACH procedure fails to establish a connection, a RACH preamble signature is repeated periodically using a defined or pre-allocated set of resource blocks of an uplink channel.
  • a modified RACH procedure is instead initiated. This modified RACH procedure transmits a RACH preamble signature repeatedly using a set of resource blocks which are repeatedly allocated from the uplink channel.
  • RACH preamble signature This enables the RACH preamble signature to be repeatedly transmitted so that the energy from these repeated transmissions may be combined by the network in order to detect the presence of the RACH preamble signature transmitted by network nodes in a poor coverage area such as, for example, an MTC device located in a basement.
  • the step of repeatedly transmitting comprises repeatedly transmitting an identical RACH preamble signature using a periodically repeating defined set of resource blocks of the uplink channel. Accordingly, the same RACH preamble signature may be repeatedly transmitted using the allocated resources. This repeated transmission of the same RACH preamble signature facilitates the detection of that signature within the combined transmissions.
  • the periodically repeating defined set of resource blocks comprises a periodically repeating group of resource blocks within a periodically repeating selection of subframes of the uplink channel. Accordingly, groups of resource blocks may be allocated within sub-frames and the same repeating allocation of resource blocks within sub-frames may occur during each periodic repetition of the defined set.
  • the step of repeatedly transmitting comprises repeatedly transmitting the identical RACH preamble signature in each periodically repeating group of resource blocks within the periodically repeating selection of subframes. Accordingly, each group of resource blocks within the defined set may be used to transmit the RACH preamble signature. That is to say, the RACH preamble signature may be repeated multiple times within the same defined set.
  • the identical RACH preamble signature comprises a sequence of RACH preamble signatures and the step of repeatedly transmitting comprises repeatedly transmitting the sequence of RACH preamble signatures using the periodically repeating group of resource blocks within the periodically repeating selection of subframes.
  • the RACH preamble signature may be made up of a sequence of RACH preamble signatures and that sequence may be transmitted by the groups of resource blocks within the defined set.
  • the method comprises the step of receiving an indication of a plurality of the periodically repeating defined sets. Accordingly, more than one defined set may be provided, each of which may be utilised for the transmission of a RACH preamble signature.
  • each defined set comprises differing selected groups of resource blocks from selected subframes. Having different groups of resource blocks selected from different sub-frames helps to ensure spectral diversity of each defined set.
  • each defined set comprises selected groups of resource blocks from selected sub-bands from selected subframes.
  • at least one defined set includes at least one non-contiguous group of selected resource blocks from at least one selected sub-frame. By utilising noncontiguous, adjoining or adjacent resource blocks within a group can help to increase the power spectral density of the transmission of the RACH preamble signature.
  • the at least one defined set includes at least one non-contiguous group of selected resource blocks at sub-band edges from selected sub-frames.
  • the method comprises the step of selecting the defined set from the plurality of defined sets randomly. Selecting a defined set randomly helps to prevent transmission collisions between different network nodes. In one embodiment, the method comprises the step of selecting, as the defined set, one of the plurality of defined sets having resource blocks within each sub-band. By selecting a defined set having resource blocks in each sub-band provides for spectral diversity and may assist in the detection of the RACH preamble signature.
  • the method comprises the step of selecting, as the defined set, one of the plurality of defined sets having resource blocks predominantly within a selected sub-band. Accordingly, the defined set may be selected such that a majority of the resource blocks are within a particular sub-band in order to enhance the transmission of the RACH preamble signature within that sub-band.
  • the method comprises the step of determining a sub-band of a strongest received pilot and selecting, as the defined set, one of the plurality of defined sets having resource blocks predominantly within the sub-band. Accordingly, that sub- band on which the strongest pilot signal is being received may be selected. This helps to maximise the possibility that the transmissions of the RACH preamble signature on that sub-band are likely to be received by the network.
  • the method comprises the step of determining a service requirement for the network node and selecting, as the defined set, one of the plurality of defined sets which has characteristics which matches the service requirement most closely. Accordingly, the characteristics of the defined set may be selected such that they best match the requirements of the network node.
  • the method comprises the step of ceasing to transmit the RACH preamble signature when a random access response message is received. Halting transmission of the preamble signature helps to free resources for use by other network nodes. In one embodiment, the method comprises the step of preventing initiation of the
  • the method comprises receiving a channel with a first format in response to receiving the random access response message in response to a RACH preamble transmission using a first one of said defined sets and receiving a channel with a second format in response to receiving a random access response message in response to a RACH preamble transmission using a second one of said defined sets.
  • the method comprises transmitting a channel with a first format in response to receiving the random access response message in response to a RACH preamble transmission using a first one of said defined sets and transmitting a channel with a second format in response to receiving a random access response message in response to a RACH preamble transmission using a second one of said defined sets.
  • a plurality of different RACH preamble signatures are defined and the method comprises the step of selecting one of the plurality of different RACH preamble signatures as the RACH preamble signature.
  • the one of the plurality of different RACH preamble signatures is selected randomly.
  • the RACH procedure and the repeated RACH preamble signature comprise the same RACH preamble signature.
  • a network node comprising:
  • transmission logic operable, on a failure to establish a connection after initiating a RACH procedure, to repeatedly transmit a RACH preamble signature using a defined set of resource blocks of an uplink channel.
  • the transmission logic is operable to repeatedly transmit an identical RACH preamble signature using a periodically repeating defined set of resource blocks of the uplink channel.
  • the periodically repeating defined set of resource blocks comprises a periodically repeating group of resource blocks within a periodically repeating selection of subframes of the uplink channel.
  • the transmission logic is operable to repeatedly transmit the identical RACH preamble signature in each periodically repeating group of resource blocks within the periodically repeating selection of subframes.
  • the identical RACH preamble signature comprises a sequence of RACH preamble signatures and the transmission logic is operable to repeatedly transmit the sequence of RACH preamble signatures using the periodically repeating group of resource blocks within the periodically repeating selection of subframes.
  • the network node comprises logic operable to receive an indication of a plurality of the periodically repeating defined sets.
  • each defined set comprises differing selected groups of resource blocks from selected subframes. In one embodiment, each defined set comprises selected groups of resource blocks from selected sub-bands from selected subframes.
  • At least one defined set includes at least one non-contiguous group of selected resource blocks from at least one selected sub-frame.
  • the at least one defined set includes at least one non-contiguous group of selected resource blocks at sub-band edges from selected sub-frames.
  • the transmission logic is operable to select the defined set from the plurality of defined sets randomly.
  • the transmission logic is operable to select, as the defined set, one of the plurality of defined sets having resource blocks within each sub-band. In one embodiment, the transmission logic is operable to select, as the defined set, one of the plurality of defined sets having resource blocks predominantly within a selected sub-band. In one embodiment, the network node comprises determining logic operable to determine a sub-band of a strongest received pilot and wherein the transmission logic is operable select, as the defined set, one of the plurality of defined sets having resource blocks predominantly within the sub-band.
  • the network node comprises determining logic operable to determine a service requirement for the network node and wherein the transmission logic is operable select, as the defined set, one of the plurality of defined sets which has characteristics which matches the service requirement most closely.
  • the transmission logic is operable cease transmission of the RACH preamble signature when a random access response message is received. In one embodiment, the transmission logic is operable to prevent initiation of the
  • the network node comprises logic operable to receive a channel with a first format in response to receiving the random access response message in response to a RACH preamble transmission using a first one of said defined sets and to receive a channel with a second format in response to receiving a random access response message in response to a RACH preamble transmission using a second one of said defined sets.
  • the network node comprises logic operable to transmit a channel with a first format in response to receiving the random access response message in response to a RACH preamble transmission using a first one of said defined sets and to transmit a channel with a second format in response to receiving a random access response message in response to a RACH preamble transmission using a second one of said defined sets.
  • a plurality of different RACH preamble signatures are defined and wherein the transmission logic is operable select one of the plurality of different RACH preamble signatures as the RACH preamble signature.
  • the RACH procedure and the repeated RACH preamble signature comprise the same RACH preamble signature.
  • a wireless telecommunications network node method comprising: repeatedly combining transmitted signals received using a defined set of resource blocks of an uplink channel to detect a RACH preamble signature.
  • the step of repeatedly combining comprises repeatedly combining signals received using a periodically repeating defined set of resource blocks of the uplink channel to detect an identical, repeating RACH preamble signature.
  • the periodically repeating defined set of resource blocks comprises a periodically repeating group of resource blocks within a periodically repeating selection of subframes of the uplink channel.
  • the step of repeatedly combining comprises repeatedly combining signals received in each periodically repeating group of resource blocks within the periodically repeating selection of subframes.
  • the step of repeatedly combining comprises repeatedly combining signals in each periodically repeating group of resource blocks within the periodically repeating selection of subframes to detect the identical, repeating RACH preamble signature.
  • the method comprises transmitting an indication of a plurality of the periodically repeating defined sets.
  • the step of repeatedly combining comprises repeatedly combining signals received using each periodically repeating defined set of resource blocks of the uplink channel to detect a RACH preamble signature.
  • each defined set comprises differing selected groups of resource blocks from selected subframes.
  • each defined set comprises selected groups of resource blocks from selected sub-bands from selected subframes. In one embodiment, at least one defined set includes at least one non-contiguous group of selected resource blocks from at least one selected sub-frame. In one embodiment, the at least one defined set includes at least one non-contiguous group of selected resource blocks at sub-band edges from selected sub-frames.
  • the method comprises transmitting a random access response message upon detection of the RACH preamble signature.
  • a network node comprising: reception logic operable to combine repeatedly transmitted signals received using a defined set of resource blocks of an uplink channel to detect a RACH preamble signature.
  • the reception logic is operable to repeatedly combine signals received using a periodically repeating defined set of resource blocks of the uplink channel to detect an identical, repeating RACH preamble signature.
  • the periodically repeating defined set of resource blocks comprises a periodically repeating group of resource blocks within a periodically repeating selection of subframes of the uplink channel.
  • the reception logic is operable to repeatedly combine signals received in each periodically repeating group of resource blocks within the periodically repeating selection of subframes.
  • the reception logic is operable to repeatedly combine signals in each periodically repeating group of resource blocks within the periodically repeating selection of subframes to detect the identical, repeating RACH preamble signature.
  • the network node comprises logic operable to transmit an indication of a plurality of the periodically repeating defined sets.
  • the reception logic is operable to combine repeatedly transmitted signals received using each periodically repeating defined set of resource blocks of the uplink channel to detect a RACH preamble signature.
  • each defined set comprises differing selected groups of resource blocks from selected subframes.
  • each defined set comprises selected groups of resource blocks from selected sub-bands from selected subframes.
  • At least one defined set includes at least one non-contiguous group of selected resource blocks from at least one selected sub-frame. In one embodiment, the at least one defined set includes at least one non-contiguous group of selected resource blocks at sub-band edges from selected sub-frames.
  • the network node comprises transmission logic operable to transmit a random access response message upon detection of the RACH preamble signature.
  • a computer program product operable, when executed on a computer, to perform the method steps of the first or third aspects. Further particular and preferred aspects are set out in the accompanying independent and dependent claims. Features of the dependent claims may be combined with features of the independent claims as appropriate, and in combinations other than those explicitly set out in the claims. Where an apparatus feature is described as being operable to provide a function, it will be appreciated that this includes an apparatus feature which provides that function or which is adapted or configured to provide that function.
  • Figure 1 illustrates an example configuration of resource block for a combining set
  • Figure 2 illustrates an example embodiment which allocates resource blocks for two combining sets.
  • a Machine Type Communication (MTC) device is user equipment (UE) that is used by a machine for specific application.
  • MTC device is smart utility meter.
  • some of these smart meters may be located in basement, which suffer from high penetration loss and therefore it is difficult for the MTC device to communicate with the network. Therefore, it is desired to extend the coverage of these MTC devices by 20 dB.
  • Repetition is one way of improving the received signal of a message.
  • the receiver accumulates the signal energy of each repeated signal to a point where the signal energy is strong enough such that the message can be demodulated reliably.
  • the message is usually repeated in time and, for large coverage improvements, a large amount of repetitions may be required. For delay tolerant user data, a large amount of repetition spread over a long period of time is feasible.
  • Embodiments provide a technique whereby resources within, for example, the uplink channel are allocated to different sets.
  • Each defined set comprises a number of resource blocks within sub-frames of the uplink channel.
  • a defined set may comprise resource blocks in each of multiple consecutive sub-frames within the uplink channel.
  • These resource blocks within the defined set may be utilised for the transmission of RACH preamble signatures from the user equipment to the network. Once the transmission of the RACH preamble signature using these resource blocks has been completed across, for example, the multiple sub-frames, this is then repeated in the next following multiple sub-frames until an indication is received that the RACH preamble signature has been correctly detected.
  • the network is also aware of the defined sets and will be combining the energy received from within these resources blocks of the defined sets to try to detect whether a RACH preamble signature can be identified. This combining of repeated transmissions helps to increase the ability to distinguish the RACH preamble signature even when transmitted by user equipment located in a poor coverage area.
  • Embodiments provide multiple different defined sets of groups of resource blocks, each of which may be optimised for different conditions. The user equipment may select one of these defined sets either randomly or based on the conditions that the user equipment is experiencing. The base station will continuously attempt to decode RACH preamble signatures within each of these defined sets and identify when such detection is successful.
  • RACH preamble signature In random access, the MTC (or UE) that wishes to access the network transmits a randomly selected RACH preamble signature. If the base station (eNB) fails to detect the RACH transmission, the UE will retry at a higher power with another randomly selected RACH preamble signature. If the MTC is out of coverage, the RACH preamble signature that is transmitted at maximum power will not be detected by the eNB because the eNB is not aware of the failed RACH transmission.
  • Different format RACH signatures are possible. In particular, RACH format 2 and 3 are specified to support medium and large cells. These RACH formats have preamble signatures that are twice as long as those for normal usage (i.e. RACH format o).
  • Embodiments provide a technique which defines two types of sets of resources (i.e. resource blocks (RBs) and subframes) for RACH signalling, namely: combining sets of resources and a non-combining set of resources.
  • Signalling is provided to indicate the resources (typically in time and frequency) of the combining and non-combining set(s) to the UEs.
  • a combining set contains a set of resources (RBs and subframes) that are used for repeatedly transmitting a RACH preamble signature that can be combined or accumulated in the eNB receiver, i.e. for MTC devices requiring RACH coverage extension.
  • the MTC device typically transmits at least two RACH preamble signatures where each RACH preamble signature is transmitted using the resources defined in a combined set.
  • the first RACH preamble signature is typically selected randomly by the MTC device as per the conventional RACH procedure mentioned above.
  • the subsequent RACH preamble signatures are typically the same as that of the first RACH preamble signature, but may also be randomly selected when transitioning to the combining technique; the same selected RACH preamble signature is then repeated using the combining set resource blocks.
  • a sequence of RACH preamble signatures may be transmitted by the combining set resource blocks and this sequence of RACH preamble signatures is then repeated by each repetition of the combining set resource blocks.
  • the eNB accumulates the signal energy from each of these resources, i.e.
  • More than one combining set can be configured and the resources in these combining sets can overlap.
  • the combining sets can be indicated using broadcast or dedicated RRC signalling to the MTC devices. Should user equipment require to use the combining set to establish a connection with the network, then the user equipment may bypass or prevent attempting to establish a subsequent connection with the network using the conventional RACH procedure for a selected or fixed period of time thereafter since it is likely that the conventional RACH procedure will fail once again.
  • the number of Resource Blocks forming a group (in a subframe) used for the conventional RACH procedure mentioned above is 6. It should be noted that the number of Resource Blocks defined for a single RACH transmission in embodiments can be different to that used for the conventional RACH procedure mentioned above. For example, two groups of 3 Resource Blocks over 2 subframes can be used to send a single RACH transmission, which would result in higher power spectral density (PSD) in the RACH preamble signature and lower noise power in the receiver (since a smaller bandwidth is used). It should also be noted that the Resource Blocks used for a single RACH transmission need not be contiguous in time or frequency. In one embodiment, the reduced number of RBs per subframe with higher PSD forming a group are separated in frequency.
  • one group may comprise only the outer two RBs of a conventional RACH resource; this has the advantage of maintaining the same timing resolution accuracy as a conventional RACH transmission that uses all the RBs (at least if the radio propagation channel is not strongly frequency-selective).
  • a non-combining set contains resources for the conventional RACH procedure mentioned above. These resources are the same resources used in the for the conventional RACH procedure mentioned above.
  • the resources in the non-combining set can overlap with those in the combining set(s).
  • a combining set may consist of alternate resources of a non-combining set; given that an combining or accumulative RACH transmission will occupy multiple resources, this kind of configuration reduces blocking of the RACH resources (i.e. reduces access delay) for the non-MTC devices compared to the use of a single set of resources for both combining and non-combining RACH.
  • Fully non-overlapping combining and non- combining sets have the advantage of avoiding altogether any increase in access delay for non-MTC devices as a result of a combining RACH transmission from an MTC device, but such a configuration incurs a higher resource overhead.
  • the MTC device randomly selects one of the combining sets to transmit its RACH preamble signature. This embodiment recognizes that multiple MTC devices may try to access the network at the same time and hence randomising the selection of the combining sets helps avoid RACH collision.
  • Figure l illustrates an example configuration of resource block for a combining set.
  • the resource blocks forming the combining set 10 are allocated from the available resource blocks within subframes.
  • 4 groups of resource blocks 20-1 to 20-4 are allocated to the combining set.
  • Each group 20-1 to 20-4 is formed of 6 resource blocks 30 allocated within a sub-frame.
  • the resource blocks defined for a combining set are typically allocated or repeated periodically, as shown in Figure 1, where the combining set 10 is defined to span 5 subframes and is periodically repeated in each following 5 subframes.
  • the RACH repetition (i.e. the amount of RACH preamble signature to be transmitted) is independent of the size of the combining set. For example, in Figure 1, if a RACH preamble signature occupies the allocated resource blocks of one subframe and its repetition is 10, then the RACH preamble signature is repeated over two combining sets.
  • the RACH preamble signature repetition can be MTC device specific, i.e. different MTC devices in the cell can have different RACH preamble signature repetition factors. On the other hand, if the RACH repetition is less than the size of the combining set, then the RACH repetition can stop prior to the end of a combining set period. It should be noted that the MTC device can also stop its RACH preamble signature repetition once it receives an acknowledgement (i.e. Random Access Response) from the network. For example if the MTC device is configured to perform a maximum of 5 repetitions but it receives a Random Access Response after transmitting 2 repetitions, then it can stop transmitting the rest of the RACH preamble signature transmissions (repetitions).
  • an acknowledgement i.e. Random Access Response
  • the first RACH preamble signature transmission occurs at the beginning of a combining set period. This provides a distinct energy accumulation window for the eNB which may reduce eNB complexity.
  • the MTC devices can use a predefined sequence of preamble signatures. There are 64 preamble signatures available, a sequence of preamble signature can be for example, preamble signature 5, 10, 32 and 1.
  • the MTC device transmits each preamble signature in each of the Resource Block in the combining set. For example, in Figure 1, this MTC device will transmit preamble signature 5 in the 1st subframe, 10 in the 2nd subframe, 32 in the 3rd subframe and 1 in the 5th subframe (there are no resource configured for the 4th subframe of the combining set).
  • the MTC device can first perform random access using resources in the non-combining set. If it fails to access the network after reaching a predefined power over a predefined number of attempts, it will use the combining set. This allows MTC device that are closer to the eNB (i.e. not in coverage extension region) to use the legacy resource and only MTC devices that actually needs the coverage extension to use those resources defined for coverage extension.
  • Figure 2 illustrates an example embodiment which allocates resource blocks for 2 combining or accumulative sets: combining set 1 and combining set 2 and 1 non- combining set.
  • Combining set 1 has a periodicity of 5 subframes, whilst combining set 2 has a periodicity of 10 subframes.
  • Combining sets 1 and 2 have overlapping resources in the 3rd subframe.
  • the resources in combining set 1 also overlaps with that in of the non-combining set in the 6th subframe.
  • the resources defined for the 1st subframe of combining set 2 do not occupy 6 Resource Blocks but only 2. This is to illustrate one of the embodiments described in the previous section.
  • MTCi and MTC2 are located in basements and both wish to access the network. Both devices are configured for 8 RACH preamble signature repetitions. The following are the steps taken by both devices: 1) MTCi randomly selects combining set 1 for RACH transmissions whilst MTC2 randomly selects combining set 2 for RACH transmissions.
  • MTCi randomly selects RACH preamble signature 5 whilst MTC2 randomly selects RACH preamble signature 19
  • MTCi transmits RACH preamble signature 5;
  • MTC2 transmits half of preamble signature 19 (since only half of the resources are available).
  • the half of the RACH preamble is transmitted at a higher Power Spectral Density (PSD) than what it would be if it is transmitted using the full 6 Resource Blocks;
  • PSD Power Spectral Density
  • the RACH transmission from MTCi is not detected.
  • the RACH transmission from MTC2 is not complete and hence nothing is detected.
  • MTCi performs a repetition of the RACH preamble signature 5;
  • MTC2 transmits the remaining half of the 1st transmission of preamble signature 19;
  • the eNB combines the signal energy from subframe 1 and subframe 2 of combining set 1;
  • the eNB concatenates the signal from subframe 1 and subframe 2 of combining set 2 (knowing that each subframe contains only half of the preamble signature);
  • the eNB fails to detect any RACH transmission.
  • MTCi performs a third repetition of preamble signature 5;
  • MTC2 performs a second repetition of preamble signature 19 (the full preamble signature);
  • the eNB combines signal energy from the previous subframes in the combining sets but fails to detect any RACH transmissions.
  • MTCi transmits its fourth repetition of preamble signature 5;
  • MTC2 transmits its third repetition of preamble signature 19;
  • the eNB combines signal energy but fails to detect any RACH transmissions.
  • MTCi transmits its fifth repetition of preamble signature 5;
  • MTC2 does not transmit any preamble signature since no resource is configured in this subframe for combining set 2;
  • the eNB combines signal energy for combining set 1 but fails to detect any RACH transmission.
  • MTCi transmits its sixth repetition of preamble signature 5;
  • MTC2 transmits its fourth repetition of preamble signature 19;
  • the eNB combines signal energy but fails to detect any RACH transmission.
  • MTCi transmits its seventh repetition of preamble signature 5; b. MTC2 does not transmit any RACH since no resource is configured in this subframe for combining set 2;
  • the eNB combines signal energy for combining set 1 and successfully detects preamble signature 5.
  • the eNB sends a Random Access Response to MTCi.
  • subframe 9 & 10 no preamble signature is transmitted by MTCi or MTC2.
  • MTCi has received its Random Access Response and hence stops its RACH preamble signature repetition.
  • MTC2 does not have any resources configured for RACH preamble signature transmission.
  • subframe 12 In subframe 11, combining set 2's periodic cycle restarts and MTC2 continues with its RACH transmission and transmits its 5th repetition of the first half of preamble signature 19. As in subframe 1, MTC2 sends only half of the preamble signature.
  • MTC2 transmits the remaining half of its 5th repetition of preamble signature 19.
  • the eNB still fails to detect any RACH transmission after combining signal energy from the previous combining set resources.
  • MTC2 transmits its sixth repetition of preamble signature 19. This time, the eNB successfully detects preamble signature 19 and proceeds to send a Random Access Response. The RACH repetition for MTC2 therefore ends.
  • embodiments allow RACH coverage to be extended for MTC devices located poor coverage areas such as, for example, in basements. This approach does not require additional preamble signatures to be defined.
  • program storage devices e.g., digital data storage media, which are machine or computer readable and encode machine- executable or computer-executable programs of instructions, wherein said instructions perform some or all of the steps of said above-described methods.
  • the program storage devices may be, e.g., digital memories, magnetic storage media such as a magnetic disks and magnetic tapes, hard drives, or optically readable digital data storage media.
  • the embodiments are also intended to cover computers programmed to perform said steps of the above-described methods.
  • processors may be provided through the use of dedicated hardware as well as hardware capable of executing software in association with appropriate software.
  • the functions may be provided by a single dedicated processor, by a single shared processor, or by a plurality of individual processors, some of which may be shared.
  • processor or “controller” or “logic” should not be construed to refer exclusively to hardware capable of executing software, and may implicitly include, without limitation, digital signal processor (DSP) hardware, network processor, application specific integrated circuit (ASIC), field programmable gate array (FPGA), read only memory (ROM) for storing software, random access memory (RAM), and non volatile storage. Other hardware, conventional and/or custom, may also be included. Similarly, any switches shown in the Figures are conceptual only. Their function may be carried out through the operation of program logic, through dedicated logic, through the interaction of program control and dedicated logic, or even manually, the particular technique being selectable by the implementer as more specifically understood from the context.
  • DSP digital signal processor
  • ASIC application specific integrated circuit
  • FPGA field programmable gate array
  • ROM read only memory
  • RAM random access memory
  • non volatile storage Other hardware, conventional and/or custom, may also be included.
  • any switches shown in the Figures are conceptual only. Their function may be carried out through the operation of program logic, through dedicated logic, through
  • any block diagrams herein represent conceptual views of illustrative circuitry embodying the principles of the invention.
  • any flow charts, flow diagrams, state transition diagrams, pseudo code, and the like represent various processes which may be substantially represented in computer readable medium and so executed by a computer or processor, whether or not such computer or processor is explicitly shown.

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  • Mobile Radio Communication Systems (AREA)

Abstract

L'invention concerne un procédé de télécommunications sans fil, un produit de programme d'ordinateur et des nœuds de réseau. Le procédé du nœud de réseau de télécommunications sans fil consiste, lors d'un échec, à établir une connexion après le lancement d'une procédure RACH, à émettre répétitivement une signature de préambule RACH en utilisant un ensemble défini de blocs de ressources d'un canal de liaison montante. De cette manière, lorsque l'on ne parvient pas à établir une connexion avec le réseau avec une procédure RACH conventionnelle, on lance à la place une procédure RACH modifiée. Cette procédure RACH modifiée émet une signature de préambule RACH répétitivement en utilisant un ensemble répétitif de blocs de ressources qui sont alloués répétitivement depuis le canal de liaison montante. Cela permet d'émettre répétitivement la signature de préambule RACH de telle manière que l'énergie provenant de ces émissions répétées puisse être combinée par le réseau afin de détecter la présence de la signature de préambule RACH émise par les nœuds de réseau dans une zone où la couverture est médiocre, comme par exemple dans le cas d'un dispositif MTC situé dans un sous-sol.
PCT/EP2013/003849 2013-01-28 2013-12-19 Télécommunications sans fil WO2014114318A1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
JP2015554058A JP2016511960A (ja) 2013-01-28 2013-12-19 ワイヤレス電気通信
CN201380071485.7A CN104956760B (zh) 2013-01-28 2013-12-19 无线通信
US14/763,711 US10070463B2 (en) 2013-01-28 2013-12-19 Wireless telecommunications

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP13305094.8A EP2760248B1 (fr) 2013-01-28 2013-01-28 Télécommunications sans fil
EP13305094.8 2013-01-28

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WO2014114318A1 true WO2014114318A1 (fr) 2014-07-31

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PCT/EP2013/003849 WO2014114318A1 (fr) 2013-01-28 2013-12-19 Télécommunications sans fil

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US (1) US10070463B2 (fr)
EP (1) EP2760248B1 (fr)
JP (2) JP2016511960A (fr)
CN (1) CN104956760B (fr)
ES (1) ES2869192T3 (fr)
PL (1) PL2760248T3 (fr)
TW (1) TWI562667B (fr)
WO (1) WO2014114318A1 (fr)

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Publication number Publication date
EP2760248B1 (fr) 2021-03-10
JP6574229B2 (ja) 2019-09-11
PL2760248T3 (pl) 2021-07-19
US10070463B2 (en) 2018-09-04
TWI562667B (en) 2016-12-11
EP2760248A1 (fr) 2014-07-30
CN104956760A (zh) 2015-09-30
US20150359005A1 (en) 2015-12-10
JP2018056997A (ja) 2018-04-05
JP2016511960A (ja) 2016-04-21
CN104956760B (zh) 2019-02-19
ES2869192T3 (es) 2021-10-25
TW201446059A (zh) 2014-12-01

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